Hey Todd
I really don't know if they (CZUB) had made any other changes, either dimensionally or mechanically to the KADET 2 then the one cosmetically to the Slide Profile at the Muzzle end
I know they changed the profile of the Firing Pin end, but I believe that was done before the KADET 2 was introduced
They may have started using a longer Firing Pin now, but I don't know for sure on that one
They say that the KADET 2 isn't as tall (top to bottom) as the KADET is
There are others here that know way more than I do
Hopefully they chime-in if I've missed something